I actually have had some control over my voice. One time I was laying there paralyzed and could hear my brother in the other room, so I tried to shout for him hoping that if he came in it would shake me out of it. Unfortunately all that came out were some hoarse whispers.
On other occasions I've had minor control over my limbs, too. One time I was able to move my hands up to my face. I tried slapping myself to wake myself fully, but I wasn't able to move my arms fast enough. Also, my face didn't really register any sensation, nor did my hands. It was much like my arms were just "asleep". I don't know if anyone else has experienced this, but I often roll onto my arms when I'm sleeping and then wake up in the middle of the night with both of them completely numb up to the shoulders. I used to just thrash my torso around until I was on my back again, because without any sensation to your limbs, it is nearly impossible to move them.
But this has happened to me so many times that I've slowly learned how to "connect" to the limbs even though my brain isn't receiving any feedback from them. Now I can actually move my arms and push my body up with them, but it is fairly clumsy. It's a very odd feeling. You know normally when you move your hand, you feel like the origin of the movement is IN the hand, so to speak. It isn't a conscious direction from the brain (or at least, that's how it is for me). When the whole arm is asleep, you have to rely more on consciously causing the movement. It's kind of like walking around a familar place in the pitch dark. In the light, you don't have to think to avoid hitting the walls. In the dark, you have to use your memory and actively envision what you're doing (unless you're blind, or really used to the dark). Anyway, the point is that when I was able to move my arms during sleep paralysis, it was a very similar experience.
The paralysis then is perhaps not something absolute, but more of a result that the brain has cut the signals from your limbs in order to be able to feed you the dream sensations. Your are then almost unable to focus on your body. When you want to move your hand, you would normally be focusing on the dream stimulus that is already being fed to you, and the dream would react appropriately. But when you get into that in-between state in sleep paralysis, you simply have NO stimulus. Hence your brain does not know where to focus its attention, and you are unable to move. Just a theory, perhaps wrong, but it is the best one that fits my experiences.
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